Measurement Data - BLUE SKY SAT 12 Owner's Manual

12. Measurement Data

Conditions:
All SAT 12 measurements were made outdoors on a 58 inch stand at a
distance of 1 meter. Since a 58 inch stand is not tall enough for accurate
low-frequency measurements, a 1 meter ground plane measurement was also
made and spliced in at 125 Hz on all measurements, to generate full frequency
response. The first group of measurements were done with the speaker set in
the normal vertical configuration. The second set were done with the speaker
in the horizontal position, the tweeter and midrange located on the left side
and the plate rotated so the tweeter and midrange were vertical (as shown in
figure 4).
A Note about the off axis measurements:
When looking at a couple of the off axis measurements, such as "SAT 12
Vertical | On Axis +/- 15 Degrees Vertical" on page 15 and "SAT 12
Horizontal | On Axis, +/-15, +/-30 Horizontal" on page 17, you will
notice the low end varying by a couple of dB. Because the woofer is an
omnidirectional radiator in its operating frequency range, these level changes
are not due to directivity, but are due to the woofer in the SAT 12 moving
closer to, and further away, from the measurement microphone as the SAT 12
rotates through the various angles. At a normal listening distance of 2 meters
or more, this effect is negligible, especially when the SAT 12 is positioned as
recommend on page 8 [SAT 12 Mounting & Placement].
SAT 12 Vertical | On Axis, Full
Range / 45Hz Vs. 80Hz Input
This is a standard on-axis measurement, with the SAT 12
in the vertical configuration, comparing the full-range /
45Hz input to the 80Hz input. As you can see from the
measurements, Big Blue has flat frequency response with
no spectral tilt.
Page 14
Figure 4
Vertical
SAT 12 Vertical | On Axis Vs.
Listening Window
The listening window is a power average of on axis, +/-15
degrees vertical and +/-15 degrees horizontal and gives
an indication of how a speaker performs when you are not
directly on axis. Ideally the average should be very close
to the on axis response
LEFT Horizontal